Motor-drive.



BESTAV J. 1. WOOD. AILABLE COI."

MOTOR DRIVE.'

APPucmou man SEPT. 2. 191s.

Patented Nov. 28, 1916.

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PATENT OFFICE.

JAMES J. WOOD, OF FORT WAY-NEL INDIANA, ASSIGNOB, T GENERAL ELCTRIO COMPANY, A CORZPORATION 0F NEW YORK.

- AMorort-:DRIVE specification of Leners Patent.

.Patented Nov. 28, 1916.

Applicationle-d September 2, 1915. Serial No, l18,719.

' rangement and construction of such a'n electric motor drive is controlled by a switch and a friction brake with a single actuating member for the switch andcbrake which closes the switch to complete the motor circuit and 'progressively I The various features 'of novelty which cordance with my invention;

- sewing machine.

. tion from the l compa-nyingdrawings, 1 1s a view of a sewing machine.

decreases the effectiveness of the brake.

characterize my invention are pointed out with particularity in the claimsannexed to and forming a part of this specification.

.For a better understanding of my inven-4 tion reference may be had tothe following description taken in'connection with the acin Which- Figure equipped with an electric motor drive in ac- Figs. 2 and 3 are side views of the motor of Fig. 1; Fig. 4 is a sectional view on the line 4-4 of Fig. 2; Fig. 5 is motor, and Fig. 6 is a View of a detail.

In Fig. 1 of the drawings, 1 is the supporting stand of the-machine on the top of which ismounted the usual table 2. In this table is countersunk the bed-plate 3 of the vThe head ofthe sewing machine is mounted on the bed-plate 3 and consists of the usual pillar 4, horizontal arm, ily-wheel 5 and drive wheel 6, and contains the usual mechanism' for transmitting modrive wheel 6 t0 the needle bar.

v The bed-plate 3 contains the usual shuttle drive-Wheel.

iis

and feed mechanism and means for transmitting motion thereto through the pillar and The o rdinary foot` power mechanism is mounted in the stand 1- and consists of a pivoted treadle 7 adapted to transmit ower through a connecting rod 8 to a cran 9 of the main driving wheel 10.

For foot operation, power 1s transmitted from the main driving wheel 10 to the driving wheel through a belt 11. The motor drive Jfor the machmeconsists of an electric' for its object a novel ar in which the electric motor l a side view of one end of the suitable, manner, as by means of lugs or hrarkets 13 on the motor frame and bolts which pass through hollow spacing posts 14., 'lhese parts may be of any well known or usual construction.

'lhe mechanism for is shown in detail in Figs. 2 to 6. The motor dis controlled by a friction brake 15 and switch 16, both of which are actuated by a slide 17. The slide 17 has a slot and pin connectionl with the-motor frame and is adapted to move in substantially a straight line. A brake lever 18 is operatively connected with the brake 15 and the slide 17 and is preferably pivotcd on the motor frame, thev pivot being mounted inv projecting lugs 19 which are shown as being cast integral with the frame. The connection between the brake lever and the slide is preferably also a slot and pin one, lf the slide 17 is moved downwardly from the nor mal position` shown in the drawings by means of a. cord or chain 20, it first closes the switch 16 and then progressively decreases the effectiveness of the brake 15 on the motor, permitting the motor to run at any speedtdcsired up to its maximum. The chain 20`1riay be connected to a. hook Q1 on the treadle'f?.` A spring 22 engages the brake lever 18-and acts in a controlling themotor direction to apply the 28 is placed between the two stationary 25 and is connected to the outer rotaplates 29. The plate tabie plate 2.7 b v a dowel pin 28 is split as shown in as a spring so that the brakeivill not grip too quickly. The inner plate 30 has a hub 31 which surrounds one of the bearings for the motor shaft and is prevented from rotating by apin which engages a slot in the hub 81. The stationary plates 25 have projecting lugs which engage pins 26 mounted on the inner plate 30. The end 33 of the brake leveris bifurcated Vand straddles the a shaft. 24. This-end of the brake'leve'r nor- 'mallyl engages the' stationary friction plate 30. The other endv34' of the brake lever has a'pin 35 which engages the slot- 36 in the slide .17. The slide has a -second slot 37 is'arranged to bridge the stationary contacts and thereby complete the motor circuit.'

The movable contact 41 is carried on the end of a switch arm 42 pivoted on the pin'38.

A spring43 is connected at one end to the' free end of the switch-arxn42 and at the other end to the slide 17 All of the control mechanism is mounted on the motor frame so that when the motoris fastened to the.

' bed-.plate as described above, with its pulley 44 connected to the fly-wheel 5 by a belt 45,

" Aand the driving belt 11, loosened or disconnected, it is ready for operation.- 'If the motor isconnected to a suitable' source of current supply, and thetreadle 7' is moved to pull the chain 20 downward, the

slide 17 is moved downward, guided by the pin 38. This motion of'slide 17 first changes v the angle of null on' spring 43so that theswitch arm -is rotated on 'the pin 38 from the position shown in Fig. 2 to the position in which the contacts 440 are connected together by the contact 41 to complete the motorcircuit. The motor being a series motor, imme diately exerts its maximum torque, but the pressure between the frictioni plates of brake l5- has 'not beenappreciably relieved vand consequently the motor lis girevefnted fromv rotating, Further motion o the treadle 7 to 'pullthe chain- 20 farther downward, moves the slide so that the pin -35 onthe brake lever 18-is engaged by the .end 4of thev slot 36 in the slide 17, whereb ,the-vl brake lever is rocked` on its pivot an the spring 22 is compressed. This relieves the pressure between 'the friction plates and the motorbegins tol "rotate, rotating'the pulley 44 and through the belt -45', the ily-wheel 5, which in'this case acts as lthe driving wheel of the machine. If

` the spring 22 is only partially compressed,l the pressure-between the friction plates is .only partially reduced, and the motor and machine'run 'at minimuml speed. If the spring 22 is compressed so as'to gradually relieve the pressure between the friction-- plates, the'braking eii'ect on'- the motor is gradually reduced, permitting a gradual increase in speed -until :maximum speed` is reached.

` 'l When 'the trea'dlev` 'is rocked back,` the spring 23 gradually moves slide 17 upward toward'the positionshown in the drawings,

the spring 22 pressing brake lever 18 against BEST AVAILABLECOP L frictionplate 30 and gradually increasing the friction between friction plates 25 and friction plates 27 and 28, thereby causing a gradual vreduction in speed of the machine and motor until the motor is finally brought' to a standstill.' The spring 23 then moves Slide 17 so as to change the angle of pull of spring 43, and causes it to move switch arm 42 into the position in which the circuit between contacts 40 is opened. The lower ends of the slots 37 and 36 in the slide in this po- `sition engage the pins 38 and 35, respectively. The slide is shown as bei-ng provided with suitable stop pins 46 and 47 for'bringmg the .slide into positive engagement with the switch lever 42 when in either of its extreme positions.

I desire it to be understood that .my inveni i tion is not limited to the particular arrangement shown and described and I aim in th'e appended claims to cover all modifications which do not depart from the spirit and scope of my invention.

What I'claim as new and desirefto secure :by Letters Patent of the United States, is

` 1. The ombination with a machine to be driven, of an electric motor adapted to drive the same, and m'eans for controlling said motor comprising a switch yfor the motor supply circuit, 'a friction brake for said motor, a brake lever operatively 'connected with said brake, a slide having a slot and pin connection with the motor frame and opera- 'tively'connected with said switch and said brake lever, said slide being adapted to move in a substantially 'straight line', and means for actuating said slide'to close said switch and progressively release said brake.

2. The combination with a machine to be driven, of an electric motor adapted to drive;

the same, and means for controlling said 'motor comprising 'a switch for the motor supply circuit,a slide having a slot and pin connection with the motor frame and being operatively connected with said switch, a

friction brake for said motor, a brake lev'er -pivotally mounted on the motor frame and. operatively connected with said brake, saidv brake lever having a slot and pin connection with said slide-and means for actuating said slide to close-said -switch and progressively release said-brake. v

3. The combination with a machineto be driven, of an electric motor adapted to drive the same, and means for controlling said motor comprising a switch for .the motor supply circuit, a friction brake for said motor, a brake lever operatively connected with said brake, a slide having a slot and pin connection with the motor frame and operatively Aconnected with said switch and said brake lever, means for actuating said slide to close said switch and progressively release said brake, spring means engagin" said brake lever for normally applying sai 1,206,834 BEST AVAILABLE COP ai brake, 4and other spring means operatively connection with the motor frame and being operatively connected with -said switch, a

.friction brake for said motor, a brake lever pivotally mounted on the'motor frame and operatively connected with said brake, said brake lever having a slot and pin connection with said slide, means for actuating said slide toclse said switch 'and progres- 'sively release said brake, spring means entiona gaging said brake lever for normallyapplymg 'said brake, and others ring means operatively'associated with said slide for normally maintaining the 'slide in' th.l position in which theswitch is open and" he brakeY applied.l Y 5."The combination with a machine `to be the same, and means for controlling said motor comprising aswitch for the motor supply circuit, a slide having a slotand pin .connection with the motor frame and being operatively connected Withsaid switch, staand lrotatable friction plates sur?, rounding the motor shaft, a brake lever pivotally 'mounted on the frame of Asaid motor and operatively connected with "said friction plates, said brake lever having a slot' and'-pin` .connection with said slide, means for actuating said slide to close said switch and progressively release said brake, spring means engaging said brake leverfor normally maintaining said 'friction plates. in engagement with each other, and other spring means operatively associated .with said slide for normally maintainingsaid `'slide in the position in which the switch is open and the brake applied. v

plied.

v`6. The combination with a machine to be driven, of an electric motor adapted to drive the same, and means for controlling said lmotor comprising a switch for the motor supply circuit, stationary and rotatable friction plates surrounding the motor shaft, a slide having aslotv and pin connection with the motor frame and being operatively connected with said switch, a brake leverpivotally mounted on the motor frame and having a bifurcated end straddling the motor shaft, said bifurated end engaging one of the stationary friction plates, the other end of said brake lever having a slot and pin connection with said slide, means for actuating said slide to close said switch and progressively release said b rake, spring means engaging said brake lever for normally maintaining said friction plates in engagement with each other, and other spring means operatively associated With said slide and normally' maintainin said slide in thev position in which'the' switch is open and the brake applied.

' 7. The combination with a machine to be supply circuit, a; friction brake for said mo- -driven, of an electric motor adapted todrive I driven, of an electric motor adapted to drive.

tor, a brake lever pivotally mounted on the motor frame and operatively connected with said brake, a slidehaving a slot andpin connection with the motor frame and being operatively connected with said switch and said brake lever, means for actuating said slide to close said switch and progressively release said brake, spring means engaging said brake lever for normally app ying said brake, ,and other spring means having one end attachedto said slide and the other'end attached to the motor frame for normallyv maintaining the slide in the position in` which the switch is open and `the brake ap- In witness whereof, I have .hereunto set my hand this 30th day of August 1915.

' Y JAMES J. WOOD. 

